Increasing transmission capacity in the New Zealand power system through smart grid technology

Hydroelectric generation currently constitutes 53% of the total generation capacity in New Zealand. The majority of this generation is located in the South Island and is exported to the North Island via an HVDC link. At times the amount of generation that can be transferred is limited by the thermal capacity of 220 kV transmission system. This paper details a proposed system protection scheme (SPS) that will increase this transfer capacity. Scheme implementation is scheduled for October 2014. This minimal cost scheme will facilitate a more economic outcome to the New Zealand electricity market as this additional renewable generation can displace more costly thermal plant.